2 Copyright 1995, 1996 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 static boolean elf_link_add_object_symbols
23 PARAMS ((bfd *, struct bfd_link_info *));
24 static boolean elf_link_add_archive_symbols
25 PARAMS ((bfd *, struct bfd_link_info *));
26 static boolean elf_export_symbol
27 PARAMS ((struct elf_link_hash_entry *, PTR));
28 static boolean elf_adjust_dynamic_symbol
29 PARAMS ((struct elf_link_hash_entry *, PTR));
31 /* This struct is used to pass information to routines called via
32 elf_link_hash_traverse which must return failure. */
34 struct elf_info_failed
37 struct bfd_link_info *info;
40 /* Given an ELF BFD, add symbols to the global hash table as
44 elf_bfd_link_add_symbols (abfd, info)
46 struct bfd_link_info *info;
48 switch (bfd_get_format (abfd))
51 return elf_link_add_object_symbols (abfd, info);
53 return elf_link_add_archive_symbols (abfd, info);
55 bfd_set_error (bfd_error_wrong_format);
61 /* Add symbols from an ELF archive file to the linker hash table. We
62 don't use _bfd_generic_link_add_archive_symbols because of a
63 problem which arises on UnixWare. The UnixWare libc.so is an
64 archive which includes an entry libc.so.1 which defines a bunch of
65 symbols. The libc.so archive also includes a number of other
66 object files, which also define symbols, some of which are the same
67 as those defined in libc.so.1. Correct linking requires that we
68 consider each object file in turn, and include it if it defines any
69 symbols we need. _bfd_generic_link_add_archive_symbols does not do
70 this; it looks through the list of undefined symbols, and includes
71 any object file which defines them. When this algorithm is used on
72 UnixWare, it winds up pulling in libc.so.1 early and defining a
73 bunch of symbols. This means that some of the other objects in the
74 archive are not included in the link, which is incorrect since they
75 precede libc.so.1 in the archive.
77 Fortunately, ELF archive handling is simpler than that done by
78 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
79 oddities. In ELF, if we find a symbol in the archive map, and the
80 symbol is currently undefined, we know that we must pull in that
83 Unfortunately, we do have to make multiple passes over the symbol
84 table until nothing further is resolved. */
87 elf_link_add_archive_symbols (abfd, info)
89 struct bfd_link_info *info;
92 boolean *defined = NULL;
93 boolean *included = NULL;
97 if (! bfd_has_map (abfd))
99 /* An empty archive is a special case. */
100 if (bfd_openr_next_archived_file (abfd, (bfd *) NULL) == NULL)
102 bfd_set_error (bfd_error_no_armap);
106 /* Keep track of all symbols we know to be already defined, and all
107 files we know to be already included. This is to speed up the
108 second and subsequent passes. */
109 c = bfd_ardata (abfd)->symdef_count;
112 defined = (boolean *) bfd_malloc (c * sizeof (boolean));
113 included = (boolean *) bfd_malloc (c * sizeof (boolean));
114 if (defined == (boolean *) NULL || included == (boolean *) NULL)
116 memset (defined, 0, c * sizeof (boolean));
117 memset (included, 0, c * sizeof (boolean));
119 symdefs = bfd_ardata (abfd)->symdefs;
132 symdefend = symdef + c;
133 for (i = 0; symdef < symdefend; symdef++, i++)
135 struct elf_link_hash_entry *h;
137 struct bfd_link_hash_entry *undefs_tail;
140 if (defined[i] || included[i])
142 if (symdef->file_offset == last)
148 h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
149 false, false, false);
150 if (h == (struct elf_link_hash_entry *) NULL)
152 if (h->root.type != bfd_link_hash_undefined)
154 if (h->root.type != bfd_link_hash_undefweak)
159 /* We need to include this archive member. */
161 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
162 if (element == (bfd *) NULL)
165 if (! bfd_check_format (element, bfd_object))
168 /* Doublecheck that we have not included this object
169 already--it should be impossible, but there may be
170 something wrong with the archive. */
171 if (element->archive_pass != 0)
173 bfd_set_error (bfd_error_bad_value);
176 element->archive_pass = 1;
178 undefs_tail = info->hash->undefs_tail;
180 if (! (*info->callbacks->add_archive_element) (info, element,
183 if (! elf_link_add_object_symbols (element, info))
186 /* If there are any new undefined symbols, we need to make
187 another pass through the archive in order to see whether
188 they can be defined. FIXME: This isn't perfect, because
189 common symbols wind up on undefs_tail and because an
190 undefined symbol which is defined later on in this pass
191 does not require another pass. This isn't a bug, but it
192 does make the code less efficient than it could be. */
193 if (undefs_tail != info->hash->undefs_tail)
196 /* Look backward to mark all symbols from this object file
197 which we have already seen in this pass. */
201 included[mark] = true;
206 while (symdefs[mark].file_offset == symdef->file_offset);
208 /* We mark subsequent symbols from this object file as we go
209 on through the loop. */
210 last = symdef->file_offset;
221 if (defined != (boolean *) NULL)
223 if (included != (boolean *) NULL)
228 /* Add symbols from an ELF object file to the linker hash table. */
231 elf_link_add_object_symbols (abfd, info)
233 struct bfd_link_info *info;
235 boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *,
236 const Elf_Internal_Sym *,
237 const char **, flagword *,
238 asection **, bfd_vma *));
239 boolean (*check_relocs) PARAMS ((bfd *, struct bfd_link_info *,
240 asection *, const Elf_Internal_Rela *));
242 Elf_Internal_Shdr *hdr;
246 Elf_External_Sym *buf = NULL;
247 struct elf_link_hash_entry **sym_hash;
249 Elf_External_Dyn *dynbuf = NULL;
250 struct elf_link_hash_entry *weaks;
251 Elf_External_Sym *esym;
252 Elf_External_Sym *esymend;
254 add_symbol_hook = get_elf_backend_data (abfd)->elf_add_symbol_hook;
255 collect = get_elf_backend_data (abfd)->collect;
257 /* As a GNU extension, any input sections which are named
258 .gnu.warning.SYMBOL are treated as warning symbols for the given
259 symbol. This differs from .gnu.warning sections, which generate
260 warnings when they are included in an output file. */
265 for (s = abfd->sections; s != NULL; s = s->next)
269 name = bfd_get_section_name (abfd, s);
270 if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
275 sz = bfd_section_size (abfd, s);
276 msg = (char *) bfd_alloc (abfd, sz);
280 if (! bfd_get_section_contents (abfd, s, msg, (file_ptr) 0, sz))
283 if (! (_bfd_generic_link_add_one_symbol
285 name + sizeof ".gnu.warning." - 1,
286 BSF_WARNING, s, (bfd_vma) 0, msg, false, collect,
287 (struct bfd_link_hash_entry **) NULL)))
290 if (! info->relocateable)
292 /* Clobber the section size so that the warning does
293 not get copied into the output file. */
300 /* A stripped shared library might only have a dynamic symbol table,
301 not a regular symbol table. In that case we can still go ahead
302 and link using the dynamic symbol table. */
303 if (elf_onesymtab (abfd) == 0
304 && elf_dynsymtab (abfd) != 0)
306 elf_onesymtab (abfd) = elf_dynsymtab (abfd);
307 elf_tdata (abfd)->symtab_hdr = elf_tdata (abfd)->dynsymtab_hdr;
310 hdr = &elf_tdata (abfd)->symtab_hdr;
311 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
313 /* The sh_info field of the symtab header tells us where the
314 external symbols start. We don't care about the local symbols at
316 if (elf_bad_symtab (abfd))
318 extsymcount = symcount;
323 extsymcount = symcount - hdr->sh_info;
324 extsymoff = hdr->sh_info;
327 buf = ((Elf_External_Sym *)
328 bfd_malloc (extsymcount * sizeof (Elf_External_Sym)));
329 if (buf == NULL && extsymcount != 0)
332 /* We store a pointer to the hash table entry for each external
334 sym_hash = ((struct elf_link_hash_entry **)
336 extsymcount * sizeof (struct elf_link_hash_entry *)));
337 if (sym_hash == NULL)
339 elf_sym_hashes (abfd) = sym_hash;
341 if (elf_elfheader (abfd)->e_type != ET_DYN)
345 /* If we are creating a shared library, create all the dynamic
346 sections immediately. We need to attach them to something,
347 so we attach them to this BFD, provided it is the right
348 format. FIXME: If there are no input BFD's of the same
349 format as the output, we can't make a shared library. */
351 && ! elf_hash_table (info)->dynamic_sections_created
352 && abfd->xvec == info->hash->creator)
354 if (! elf_link_create_dynamic_sections (abfd, info))
363 bfd_size_type oldsize;
364 bfd_size_type strindex;
368 /* You can't use -r against a dynamic object. Also, there's no
369 hope of using a dynamic object which does not exactly match
370 the format of the output file. */
371 if (info->relocateable
372 || info->hash->creator != abfd->xvec)
374 bfd_set_error (bfd_error_invalid_operation);
378 /* Find the name to use in a DT_NEEDED entry that refers to this
379 object. If the object has a DT_SONAME entry, we use it.
380 Otherwise, if the generic linker stuck something in
381 elf_dt_name, we use that. Otherwise, we just use the file
382 name. If the generic linker put a null string into
383 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
384 there is a DT_SONAME entry. */
386 name = bfd_get_filename (abfd);
387 if (elf_dt_name (abfd) != NULL)
389 name = elf_dt_name (abfd);
393 s = bfd_get_section_by_name (abfd, ".dynamic");
396 Elf_External_Dyn *extdyn;
397 Elf_External_Dyn *extdynend;
401 dynbuf = (Elf_External_Dyn *) bfd_malloc ((size_t) s->_raw_size);
405 if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf,
406 (file_ptr) 0, s->_raw_size))
409 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
412 link = elf_elfsections (abfd)[elfsec]->sh_link;
415 extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn);
416 for (; extdyn < extdynend; extdyn++)
418 Elf_Internal_Dyn dyn;
420 elf_swap_dyn_in (abfd, extdyn, &dyn);
421 if (dyn.d_tag == DT_SONAME)
423 name = bfd_elf_string_from_elf_section (abfd, link,
428 if (dyn.d_tag == DT_NEEDED)
430 struct bfd_link_needed_list *n, **pn;
433 n = ((struct bfd_link_needed_list *)
434 bfd_alloc (abfd, sizeof (struct bfd_link_needed_list)));
435 fnm = bfd_elf_string_from_elf_section (abfd, link,
437 if (n == NULL || fnm == NULL)
439 anm = bfd_alloc (abfd, strlen (fnm) + 1);
446 for (pn = &elf_hash_table (info)->needed;
458 /* We do not want to include any of the sections in a dynamic
459 object in the output file. We hack by simply clobbering the
460 list of sections in the BFD. This could be handled more
461 cleanly by, say, a new section flag; the existing
462 SEC_NEVER_LOAD flag is not the one we want, because that one
463 still implies that the section takes up space in the output
465 abfd->sections = NULL;
466 abfd->section_count = 0;
468 /* If this is the first dynamic object found in the link, create
469 the special sections required for dynamic linking. */
470 if (! elf_hash_table (info)->dynamic_sections_created)
472 if (! elf_link_create_dynamic_sections (abfd, info))
478 /* Add a DT_NEEDED entry for this dynamic object. */
479 oldsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
480 strindex = _bfd_stringtab_add (elf_hash_table (info)->dynstr, name,
482 if (strindex == (bfd_size_type) -1)
485 if (oldsize == _bfd_stringtab_size (elf_hash_table (info)->dynstr))
488 Elf_External_Dyn *dyncon, *dynconend;
490 /* The hash table size did not change, which means that
491 the dynamic object name was already entered. If we
492 have already included this dynamic object in the
493 link, just ignore it. There is no reason to include
494 a particular dynamic object more than once. */
495 sdyn = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
497 BFD_ASSERT (sdyn != NULL);
499 dyncon = (Elf_External_Dyn *) sdyn->contents;
500 dynconend = (Elf_External_Dyn *) (sdyn->contents +
502 for (; dyncon < dynconend; dyncon++)
504 Elf_Internal_Dyn dyn;
506 elf_swap_dyn_in (elf_hash_table (info)->dynobj, dyncon,
508 if (dyn.d_tag == DT_NEEDED
509 && dyn.d_un.d_val == strindex)
518 if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex))
522 /* Save the SONAME, if there is one, because sometimes the
523 linker emulation code will need to know it. */
525 name = bfd_get_filename (abfd);
526 elf_dt_name (abfd) = name;
530 hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym),
532 || (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd)
533 != extsymcount * sizeof (Elf_External_Sym)))
538 esymend = buf + extsymcount;
539 for (esym = buf; esym < esymend; esym++, sym_hash++)
541 Elf_Internal_Sym sym;
547 struct elf_link_hash_entry *h;
549 boolean size_change_ok, type_change_ok;
552 elf_swap_symbol_in (abfd, esym, &sym);
554 flags = BSF_NO_FLAGS;
556 value = sym.st_value;
559 bind = ELF_ST_BIND (sym.st_info);
560 if (bind == STB_LOCAL)
562 /* This should be impossible, since ELF requires that all
563 global symbols follow all local symbols, and that sh_info
564 point to the first global symbol. Unfortunatealy, Irix 5
568 else if (bind == STB_GLOBAL)
570 if (sym.st_shndx != SHN_UNDEF
571 && sym.st_shndx != SHN_COMMON)
576 else if (bind == STB_WEAK)
580 /* Leave it up to the processor backend. */
583 if (sym.st_shndx == SHN_UNDEF)
584 sec = bfd_und_section_ptr;
585 else if (sym.st_shndx > 0 && sym.st_shndx < SHN_LORESERVE)
587 sec = section_from_elf_index (abfd, sym.st_shndx);
591 sec = bfd_abs_section_ptr;
593 else if (sym.st_shndx == SHN_ABS)
594 sec = bfd_abs_section_ptr;
595 else if (sym.st_shndx == SHN_COMMON)
597 sec = bfd_com_section_ptr;
598 /* What ELF calls the size we call the value. What ELF
599 calls the value we call the alignment. */
604 /* Leave it up to the processor backend. */
607 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
608 if (name == (const char *) NULL)
613 if (! (*add_symbol_hook) (abfd, info, &sym, &name, &flags, &sec,
617 /* The hook function sets the name to NULL if this symbol
618 should be skipped for some reason. */
619 if (name == (const char *) NULL)
623 /* Sanity check that all possibilities were handled. */
624 if (sec == (asection *) NULL)
626 bfd_set_error (bfd_error_bad_value);
630 if (bfd_is_und_section (sec)
631 || bfd_is_com_section (sec))
636 size_change_ok = false;
637 type_change_ok = get_elf_backend_data (abfd)->type_change_ok;
638 if (info->hash->creator->flavour == bfd_target_elf_flavour)
640 /* We need to look up the symbol now in order to get some of
641 the dynamic object handling right. We pass the hash
642 table entry in to _bfd_generic_link_add_one_symbol so
643 that it does not have to look it up again. */
644 if (! bfd_is_und_section (sec))
645 h = elf_link_hash_lookup (elf_hash_table (info), name,
648 h = ((struct elf_link_hash_entry *)
649 bfd_wrapped_link_hash_lookup (abfd, info, name, true,
655 if (h->root.type == bfd_link_hash_new)
656 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
658 while (h->root.type == bfd_link_hash_indirect
659 || h->root.type == bfd_link_hash_warning)
660 h = (struct elf_link_hash_entry *) h->root.u.i.link;
662 /* It's OK to change the type if it used to be a weak
664 if (h->root.type == bfd_link_hash_defweak
665 || h->root.type == bfd_link_hash_undefweak)
666 type_change_ok = true;
668 /* It's OK to change the size if it used to be a weak
669 definition, or if it used to be undefined, or if we will
670 be overriding an old definition. */
672 || h->root.type == bfd_link_hash_undefined)
673 size_change_ok = true;
675 /* If we are looking at a dynamic object, and this is a
676 definition, we need to see if it has already been defined
677 by some other object. If it has, we want to use the
678 existing definition, and we do not want to report a
679 multiple symbol definition error; we do this by
680 clobbering sec to be bfd_und_section_ptr. We treat a
681 common symbol as a definition if the symbol in the shared
682 library is a function, since common symbols always
683 represent variables; this can cause confusion in
684 principle, but any such confusion would seem to indicate
685 an erroneous program or shared library. */
686 if (dynamic && definition)
688 if (h->root.type == bfd_link_hash_defined
689 || h->root.type == bfd_link_hash_defweak
690 || (h->root.type == bfd_link_hash_common
692 || ELF_ST_TYPE (sym.st_info) == STT_FUNC)))
694 sec = bfd_und_section_ptr;
696 size_change_ok = true;
697 if (h->root.type == bfd_link_hash_common)
698 type_change_ok = true;
702 /* Similarly, if we are not looking at a dynamic object, and
703 we have a definition, we want to override any definition
704 we may have from a dynamic object. Symbols from regular
705 files always take precedence over symbols from dynamic
706 objects, even if they are defined after the dynamic
707 object in the link. */
710 || (bfd_is_com_section (sec)
711 && (h->root.type == bfd_link_hash_defweak
712 || h->type == STT_FUNC)))
713 && (h->root.type == bfd_link_hash_defined
714 || h->root.type == bfd_link_hash_defweak)
715 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
716 && (bfd_get_flavour (h->root.u.def.section->owner)
717 == bfd_target_elf_flavour)
718 && (elf_elfheader (h->root.u.def.section->owner)->e_type
721 /* Change the hash table entry to undefined, and let
722 _bfd_generic_link_add_one_symbol do the right thing
723 with the new definition. */
724 h->root.type = bfd_link_hash_undefined;
725 h->root.u.undef.abfd = h->root.u.def.section->owner;
726 size_change_ok = true;
727 if (bfd_is_com_section (sec))
728 type_change_ok = true;
732 if (! (_bfd_generic_link_add_one_symbol
733 (info, abfd, name, flags, sec, value, (const char *) NULL,
734 false, collect, (struct bfd_link_hash_entry **) sym_hash)))
738 while (h->root.type == bfd_link_hash_indirect
739 || h->root.type == bfd_link_hash_warning)
740 h = (struct elf_link_hash_entry *) h->root.u.i.link;
746 && (flags & BSF_WEAK) != 0
747 && ELF_ST_TYPE (sym.st_info) != STT_FUNC
748 && info->hash->creator->flavour == bfd_target_elf_flavour
749 && h->weakdef == NULL)
751 /* Keep a list of all weak defined non function symbols from
752 a dynamic object, using the weakdef field. Later in this
753 function we will set the weakdef field to the correct
754 value. We only put non-function symbols from dynamic
755 objects on this list, because that happens to be the only
756 time we need to know the normal symbol corresponding to a
757 weak symbol, and the information is time consuming to
758 figure out. If the weakdef field is not already NULL,
759 then this symbol was already defined by some previous
760 dynamic object, and we will be using that previous
761 definition anyhow. */
768 /* Get the alignment of a common symbol. */
769 if (sym.st_shndx == SHN_COMMON
770 && h->root.type == bfd_link_hash_common)
771 h->root.u.c.p->alignment_power = bfd_log2 (sym.st_value);
773 if (info->hash->creator->flavour == bfd_target_elf_flavour)
779 /* Remember the symbol size and type. */
781 && (definition || h->size == 0))
783 if (h->size != 0 && h->size != sym.st_size && ! size_change_ok)
784 (*_bfd_error_handler)
785 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
786 name, (unsigned long) h->size, (unsigned long) sym.st_size,
787 bfd_get_filename (abfd));
789 h->size = sym.st_size;
791 if (ELF_ST_TYPE (sym.st_info) != STT_NOTYPE
792 && (definition || h->type == STT_NOTYPE))
794 if (h->type != STT_NOTYPE
795 && h->type != ELF_ST_TYPE (sym.st_info)
797 (*_bfd_error_handler)
798 ("Warning: type of symbol `%s' changed from %d to %d in %s",
799 name, h->type, ELF_ST_TYPE (sym.st_info),
800 bfd_get_filename (abfd));
802 h->type = ELF_ST_TYPE (sym.st_info);
805 if (sym.st_other != 0
806 && (definition || h->other == 0))
807 h->other = sym.st_other;
809 /* Set a flag in the hash table entry indicating the type of
810 reference or definition we just found. Keep a count of
811 the number of dynamic symbols we find. A dynamic symbol
812 is one which is referenced or defined by both a regular
813 object and a shared object, or one which is referenced or
814 defined by more than one shared object. */
815 old_flags = h->elf_link_hash_flags;
820 new_flag = ELF_LINK_HASH_REF_REGULAR;
822 new_flag = ELF_LINK_HASH_DEF_REGULAR;
824 || (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
825 | ELF_LINK_HASH_REF_DYNAMIC)) != 0)
831 new_flag = ELF_LINK_HASH_REF_DYNAMIC;
833 new_flag = ELF_LINK_HASH_DEF_DYNAMIC;
834 if ((old_flags & (ELF_LINK_HASH_DEF_REGULAR
835 | ELF_LINK_HASH_REF_REGULAR)) != 0
836 || (h->weakdef != NULL
837 && (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
838 | ELF_LINK_HASH_REF_DYNAMIC)) != 0))
842 h->elf_link_hash_flags |= new_flag;
843 if (dynsym && h->dynindx == -1)
845 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
847 if (h->weakdef != NULL
849 && h->weakdef->dynindx == -1)
851 if (! _bfd_elf_link_record_dynamic_symbol (info,
859 /* Now set the weakdefs field correctly for all the weak defined
860 symbols we found. The only way to do this is to search all the
861 symbols. Since we only need the information for non functions in
862 dynamic objects, that's the only time we actually put anything on
863 the list WEAKS. We need this information so that if a regular
864 object refers to a symbol defined weakly in a dynamic object, the
865 real symbol in the dynamic object is also put in the dynamic
866 symbols; we also must arrange for both symbols to point to the
867 same memory location. We could handle the general case of symbol
868 aliasing, but a general symbol alias can only be generated in
869 assembler code, handling it correctly would be very time
870 consuming, and other ELF linkers don't handle general aliasing
872 while (weaks != NULL)
874 struct elf_link_hash_entry *hlook;
877 struct elf_link_hash_entry **hpp;
878 struct elf_link_hash_entry **hppend;
881 weaks = hlook->weakdef;
882 hlook->weakdef = NULL;
884 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
885 || hlook->root.type == bfd_link_hash_defweak
886 || hlook->root.type == bfd_link_hash_common
887 || hlook->root.type == bfd_link_hash_indirect);
888 slook = hlook->root.u.def.section;
889 vlook = hlook->root.u.def.value;
891 hpp = elf_sym_hashes (abfd);
892 hppend = hpp + extsymcount;
893 for (; hpp < hppend; hpp++)
895 struct elf_link_hash_entry *h;
898 if (h != NULL && h != hlook
899 && h->root.type == bfd_link_hash_defined
900 && h->root.u.def.section == slook
901 && h->root.u.def.value == vlook)
905 /* If the weak definition is in the list of dynamic
906 symbols, make sure the real definition is put there
908 if (hlook->dynindx != -1
911 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
926 /* If this object is the same format as the output object, and it is
927 not a shared library, then let the backend look through the
930 This is required to build global offset table entries and to
931 arrange for dynamic relocs. It is not required for the
932 particular common case of linking non PIC code, even when linking
933 against shared libraries, but unfortunately there is no way of
934 knowing whether an object file has been compiled PIC or not.
935 Looking through the relocs is not particularly time consuming.
936 The problem is that we must either (1) keep the relocs in memory,
937 which causes the linker to require additional runtime memory or
938 (2) read the relocs twice from the input file, which wastes time.
939 This would be a good case for using mmap.
941 I have no idea how to handle linking PIC code into a file of a
942 different format. It probably can't be done. */
943 check_relocs = get_elf_backend_data (abfd)->check_relocs;
945 && abfd->xvec == info->hash->creator
946 && check_relocs != NULL)
950 for (o = abfd->sections; o != NULL; o = o->next)
952 Elf_Internal_Rela *internal_relocs;
955 if ((o->flags & SEC_RELOC) == 0
956 || o->reloc_count == 0)
959 /* I believe we can ignore the relocs for any section which
960 does not form part of the final process image, such as a
961 debugging section. */
962 if ((o->flags & SEC_ALLOC) == 0)
965 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
966 (abfd, o, (PTR) NULL,
967 (Elf_Internal_Rela *) NULL,
969 if (internal_relocs == NULL)
972 ok = (*check_relocs) (abfd, info, o, internal_relocs);
974 if (! info->keep_memory)
975 free (internal_relocs);
982 /* If this is a non-traditional, non-relocateable link, try to
983 optimize the handling of the .stab/.stabstr sections. */
985 && ! info->relocateable
986 && ! info->traditional_format
987 && info->hash->creator->flavour == bfd_target_elf_flavour
988 && (info->strip != strip_all && info->strip != strip_debugger))
990 asection *stab, *stabstr;
992 stab = bfd_get_section_by_name (abfd, ".stab");
995 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
999 struct bfd_elf_section_data *secdata;
1001 secdata = elf_section_data (stab);
1002 if (! _bfd_link_section_stabs (abfd,
1003 &elf_hash_table (info)->stab_info,
1005 &secdata->stab_info))
1021 /* Create some sections which will be filled in with dynamic linking
1022 information. ABFD is an input file which requires dynamic sections
1023 to be created. The dynamic sections take up virtual memory space
1024 when the final executable is run, so we need to create them before
1025 addresses are assigned to the output sections. We work out the
1026 actual contents and size of these sections later. */
1029 elf_link_create_dynamic_sections (abfd, info)
1031 struct bfd_link_info *info;
1034 register asection *s;
1035 struct elf_link_hash_entry *h;
1036 struct elf_backend_data *bed;
1038 if (elf_hash_table (info)->dynamic_sections_created)
1041 /* Make sure that all dynamic sections use the same input BFD. */
1042 if (elf_hash_table (info)->dynobj == NULL)
1043 elf_hash_table (info)->dynobj = abfd;
1045 abfd = elf_hash_table (info)->dynobj;
1047 /* Note that we set the SEC_IN_MEMORY flag for all of these
1049 flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY;
1051 /* A dynamically linked executable has a .interp section, but a
1052 shared library does not. */
1055 s = bfd_make_section (abfd, ".interp");
1057 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
1061 s = bfd_make_section (abfd, ".dynsym");
1063 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
1064 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
1067 s = bfd_make_section (abfd, ".dynstr");
1069 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
1072 /* Create a strtab to hold the dynamic symbol names. */
1073 if (elf_hash_table (info)->dynstr == NULL)
1075 elf_hash_table (info)->dynstr = elf_stringtab_init ();
1076 if (elf_hash_table (info)->dynstr == NULL)
1080 s = bfd_make_section (abfd, ".dynamic");
1082 || ! bfd_set_section_flags (abfd, s, flags)
1083 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
1086 /* The special symbol _DYNAMIC is always set to the start of the
1087 .dynamic section. This call occurs before we have processed the
1088 symbols for any dynamic object, so we don't have to worry about
1089 overriding a dynamic definition. We could set _DYNAMIC in a
1090 linker script, but we only want to define it if we are, in fact,
1091 creating a .dynamic section. We don't want to define it if there
1092 is no .dynamic section, since on some ELF platforms the start up
1093 code examines it to decide how to initialize the process. */
1095 if (! (_bfd_generic_link_add_one_symbol
1096 (info, abfd, "_DYNAMIC", BSF_GLOBAL, s, (bfd_vma) 0,
1097 (const char *) NULL, false, get_elf_backend_data (abfd)->collect,
1098 (struct bfd_link_hash_entry **) &h)))
1100 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
1101 h->type = STT_OBJECT;
1104 && ! _bfd_elf_link_record_dynamic_symbol (info, h))
1107 s = bfd_make_section (abfd, ".hash");
1109 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
1110 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
1113 /* Let the backend create the rest of the sections. This lets the
1114 backend set the right flags. The backend will normally create
1115 the .got and .plt sections. */
1116 bed = get_elf_backend_data (abfd);
1117 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
1120 elf_hash_table (info)->dynamic_sections_created = true;
1125 /* Add an entry to the .dynamic table. */
1128 elf_add_dynamic_entry (info, tag, val)
1129 struct bfd_link_info *info;
1133 Elf_Internal_Dyn dyn;
1137 bfd_byte *newcontents;
1139 dynobj = elf_hash_table (info)->dynobj;
1141 s = bfd_get_section_by_name (dynobj, ".dynamic");
1142 BFD_ASSERT (s != NULL);
1144 newsize = s->_raw_size + sizeof (Elf_External_Dyn);
1145 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
1146 if (newcontents == NULL)
1150 dyn.d_un.d_val = val;
1151 elf_swap_dyn_out (dynobj, &dyn,
1152 (Elf_External_Dyn *) (newcontents + s->_raw_size));
1154 s->_raw_size = newsize;
1155 s->contents = newcontents;
1161 /* Read and swap the relocs for a section. They may have been cached.
1162 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1163 they are used as buffers to read into. They are known to be large
1164 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1165 value is allocated using either malloc or bfd_alloc, according to
1166 the KEEP_MEMORY argument. */
1169 NAME(_bfd_elf,link_read_relocs) (abfd, o, external_relocs, internal_relocs,
1173 PTR external_relocs;
1174 Elf_Internal_Rela *internal_relocs;
1175 boolean keep_memory;
1177 Elf_Internal_Shdr *rel_hdr;
1179 Elf_Internal_Rela *alloc2 = NULL;
1181 if (elf_section_data (o)->relocs != NULL)
1182 return elf_section_data (o)->relocs;
1184 if (o->reloc_count == 0)
1187 rel_hdr = &elf_section_data (o)->rel_hdr;
1189 if (internal_relocs == NULL)
1193 size = o->reloc_count * sizeof (Elf_Internal_Rela);
1195 internal_relocs = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
1197 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
1198 if (internal_relocs == NULL)
1202 if (external_relocs == NULL)
1204 alloc1 = (PTR) bfd_malloc ((size_t) rel_hdr->sh_size);
1207 external_relocs = alloc1;
1210 if ((bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0)
1211 || (bfd_read (external_relocs, 1, rel_hdr->sh_size, abfd)
1212 != rel_hdr->sh_size))
1215 /* Swap in the relocs. For convenience, we always produce an
1216 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
1218 if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
1220 Elf_External_Rel *erel;
1221 Elf_External_Rel *erelend;
1222 Elf_Internal_Rela *irela;
1224 erel = (Elf_External_Rel *) external_relocs;
1225 erelend = erel + o->reloc_count;
1226 irela = internal_relocs;
1227 for (; erel < erelend; erel++, irela++)
1229 Elf_Internal_Rel irel;
1231 elf_swap_reloc_in (abfd, erel, &irel);
1232 irela->r_offset = irel.r_offset;
1233 irela->r_info = irel.r_info;
1234 irela->r_addend = 0;
1239 Elf_External_Rela *erela;
1240 Elf_External_Rela *erelaend;
1241 Elf_Internal_Rela *irela;
1243 BFD_ASSERT (rel_hdr->sh_entsize == sizeof (Elf_External_Rela));
1245 erela = (Elf_External_Rela *) external_relocs;
1246 erelaend = erela + o->reloc_count;
1247 irela = internal_relocs;
1248 for (; erela < erelaend; erela++, irela++)
1249 elf_swap_reloca_in (abfd, erela, irela);
1252 /* Cache the results for next time, if we can. */
1254 elf_section_data (o)->relocs = internal_relocs;
1259 /* Don't free alloc2, since if it was allocated we are passing it
1260 back (under the name of internal_relocs). */
1262 return internal_relocs;
1273 /* Record an assignment to a symbol made by a linker script. We need
1274 this in case some dynamic object refers to this symbol. */
1278 NAME(bfd_elf,record_link_assignment) (output_bfd, info, name, provide)
1280 struct bfd_link_info *info;
1284 struct elf_link_hash_entry *h;
1286 if (info->hash->creator->flavour != bfd_target_elf_flavour)
1289 h = elf_link_hash_lookup (elf_hash_table (info), name, true, true, false);
1293 if (h->root.type == bfd_link_hash_new)
1294 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
1296 /* If this symbol is being provided by the linker script, and it is
1297 currently defined by a dynamic object, but not by a regular
1298 object, then mark it as undefined so that the generic linker will
1299 force the correct value. */
1301 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1302 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1303 h->root.type = bfd_link_hash_undefined;
1305 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
1306 h->type = STT_OBJECT;
1308 if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC
1309 | ELF_LINK_HASH_REF_DYNAMIC)) != 0
1311 && h->dynindx == -1)
1313 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
1316 /* If this is a weak defined symbol, and we know a corresponding
1317 real symbol from the same dynamic object, make sure the real
1318 symbol is also made into a dynamic symbol. */
1319 if (h->weakdef != NULL
1320 && h->weakdef->dynindx == -1)
1322 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
1331 /* Array used to determine the number of hash table buckets to use
1332 based on the number of symbols there are. If there are fewer than
1333 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
1334 fewer than 37 we use 17 buckets, and so forth. We never use more
1335 than 521 buckets. */
1337 static const size_t elf_buckets[] =
1339 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 0
1342 /* Set up the sizes and contents of the ELF dynamic sections. This is
1343 called by the ELF linker emulation before_allocation routine. We
1344 must set the sizes of the sections before the linker sets the
1345 addresses of the various sections. */
1348 NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
1349 export_dynamic, info, sinterpptr)
1353 boolean export_dynamic;
1354 struct bfd_link_info *info;
1355 asection **sinterpptr;
1358 struct elf_backend_data *bed;
1362 if (info->hash->creator->flavour != bfd_target_elf_flavour)
1365 dynobj = elf_hash_table (info)->dynobj;
1367 /* If there were no dynamic objects in the link, there is nothing to
1372 /* If we are supposed to export all symbols into the dynamic symbol
1373 table (this is not the normal case), then do so. */
1376 struct elf_info_failed eif;
1380 elf_link_hash_traverse (elf_hash_table (info), elf_export_symbol,
1386 if (elf_hash_table (info)->dynamic_sections_created)
1388 struct elf_info_failed eif;
1389 struct elf_link_hash_entry *h;
1390 bfd_size_type strsize;
1392 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
1393 BFD_ASSERT (*sinterpptr != NULL || info->shared);
1399 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, soname,
1401 if (indx == (bfd_size_type) -1
1402 || ! elf_add_dynamic_entry (info, DT_SONAME, indx))
1408 if (! elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
1416 indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, rpath,
1418 if (indx == (bfd_size_type) -1
1419 || ! elf_add_dynamic_entry (info, DT_RPATH, indx))
1423 /* Find all symbols which were defined in a dynamic object and make
1424 the backend pick a reasonable value for them. */
1427 elf_link_hash_traverse (elf_hash_table (info),
1428 elf_adjust_dynamic_symbol,
1433 /* Add some entries to the .dynamic section. We fill in some of the
1434 values later, in elf_bfd_final_link, but we must add the entries
1435 now so that we know the final size of the .dynamic section. */
1436 h = elf_link_hash_lookup (elf_hash_table (info), "_init", false,
1439 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
1440 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
1442 if (! elf_add_dynamic_entry (info, DT_INIT, 0))
1445 h = elf_link_hash_lookup (elf_hash_table (info), "_fini", false,
1448 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
1449 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
1451 if (! elf_add_dynamic_entry (info, DT_FINI, 0))
1454 strsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
1455 if (! elf_add_dynamic_entry (info, DT_HASH, 0)
1456 || ! elf_add_dynamic_entry (info, DT_STRTAB, 0)
1457 || ! elf_add_dynamic_entry (info, DT_SYMTAB, 0)
1458 || ! elf_add_dynamic_entry (info, DT_STRSZ, strsize)
1459 || ! elf_add_dynamic_entry (info, DT_SYMENT,
1460 sizeof (Elf_External_Sym)))
1464 /* The backend must work out the sizes of all the other dynamic
1466 bed = get_elf_backend_data (output_bfd);
1467 if (! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
1470 if (elf_hash_table (info)->dynamic_sections_created)
1475 size_t bucketcount = 0;
1476 Elf_Internal_Sym isym;
1478 /* Set the size of the .dynsym and .hash sections. We counted
1479 the number of dynamic symbols in elf_link_add_object_symbols.
1480 We will build the contents of .dynsym and .hash when we build
1481 the final symbol table, because until then we do not know the
1482 correct value to give the symbols. We built the .dynstr
1483 section as we went along in elf_link_add_object_symbols. */
1484 dynsymcount = elf_hash_table (info)->dynsymcount;
1485 s = bfd_get_section_by_name (dynobj, ".dynsym");
1486 BFD_ASSERT (s != NULL);
1487 s->_raw_size = dynsymcount * sizeof (Elf_External_Sym);
1488 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
1489 if (s->contents == NULL && s->_raw_size != 0)
1492 /* The first entry in .dynsym is a dummy symbol. */
1499 elf_swap_symbol_out (output_bfd, &isym,
1500 (PTR) (Elf_External_Sym *) s->contents);
1502 for (i = 0; elf_buckets[i] != 0; i++)
1504 bucketcount = elf_buckets[i];
1505 if (dynsymcount < elf_buckets[i + 1])
1509 s = bfd_get_section_by_name (dynobj, ".hash");
1510 BFD_ASSERT (s != NULL);
1511 s->_raw_size = (2 + bucketcount + dynsymcount) * (ARCH_SIZE / 8);
1512 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
1513 if (s->contents == NULL)
1515 memset (s->contents, 0, (size_t) s->_raw_size);
1517 put_word (output_bfd, bucketcount, s->contents);
1518 put_word (output_bfd, dynsymcount, s->contents + (ARCH_SIZE / 8));
1520 elf_hash_table (info)->bucketcount = bucketcount;
1522 s = bfd_get_section_by_name (dynobj, ".dynstr");
1523 BFD_ASSERT (s != NULL);
1524 s->_raw_size = _bfd_stringtab_size (elf_hash_table (info)->dynstr);
1526 if (! elf_add_dynamic_entry (info, DT_NULL, 0))
1534 /* This routine is used to export all defined symbols into the dynamic
1535 symbol table. It is called via elf_link_hash_traverse. */
1538 elf_export_symbol (h, data)
1539 struct elf_link_hash_entry *h;
1542 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1544 if (h->dynindx == -1
1545 && (h->elf_link_hash_flags
1546 & (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0)
1548 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
1559 /* Make the backend pick a good value for a dynamic symbol. This is
1560 called via elf_link_hash_traverse, and also calls itself
1564 elf_adjust_dynamic_symbol (h, data)
1565 struct elf_link_hash_entry *h;
1568 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1570 struct elf_backend_data *bed;
1572 /* If this symbol was mentioned in a non-ELF file, try to set
1573 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
1574 permit a non-ELF file to correctly refer to a symbol defined in
1575 an ELF dynamic object. */
1576 if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0)
1578 if (h->root.type != bfd_link_hash_defined
1579 && h->root.type != bfd_link_hash_defweak)
1580 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
1583 if (h->root.u.def.section->owner != NULL
1584 && (bfd_get_flavour (h->root.u.def.section->owner)
1585 == bfd_target_elf_flavour))
1586 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
1588 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
1591 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1592 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
1594 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
1602 /* If this is a final link, and the symbol was defined as a common
1603 symbol in a regular object file, and there was no definition in
1604 any dynamic object, then the linker will have allocated space for
1605 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
1606 flag will not have been set. */
1607 if (h->root.type == bfd_link_hash_defined
1608 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
1609 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
1610 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
1611 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
1612 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
1614 /* If -Bsymbolic was used (which means to bind references to global
1615 symbols to the definition within the shared object), and this
1616 symbol was defined in a regular object, then it actually doesn't
1617 need a PLT entry. */
1618 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0
1619 && eif->info->shared
1620 && eif->info->symbolic
1621 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
1622 h->elf_link_hash_flags &=~ ELF_LINK_HASH_NEEDS_PLT;
1624 /* If this symbol does not require a PLT entry, and it is not
1625 defined by a dynamic object, or is not referenced by a regular
1626 object, ignore it. We do have to handle a weak defined symbol,
1627 even if no regular object refers to it, if we decided to add it
1628 to the dynamic symbol table. FIXME: Do we normally need to worry
1629 about symbols which are defined by one dynamic object and
1630 referenced by another one? */
1631 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0
1632 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
1633 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
1634 || ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
1635 && (h->weakdef == NULL || h->weakdef->dynindx == -1))))
1638 /* If we've already adjusted this symbol, don't do it again. This
1639 can happen via a recursive call. */
1640 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
1643 /* Don't look at this symbol again. Note that we must set this
1644 after checking the above conditions, because we may look at a
1645 symbol once, decide not to do anything, and then get called
1646 recursively later after REF_REGULAR is set below. */
1647 h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED;
1649 /* If this is a weak definition, and we know a real definition, and
1650 the real symbol is not itself defined by a regular object file,
1651 then get a good value for the real definition. We handle the
1652 real symbol first, for the convenience of the backend routine.
1654 Note that there is a confusing case here. If the real definition
1655 is defined by a regular object file, we don't get the real symbol
1656 from the dynamic object, but we do get the weak symbol. If the
1657 processor backend uses a COPY reloc, then if some routine in the
1658 dynamic object changes the real symbol, we will not see that
1659 change in the corresponding weak symbol. This is the way other
1660 ELF linkers work as well, and seems to be a result of the shared
1663 I will clarify this issue. Most SVR4 shared libraries define the
1664 variable _timezone and define timezone as a weak synonym. The
1665 tzset call changes _timezone. If you write
1666 extern int timezone;
1668 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
1669 you might expect that, since timezone is a synonym for _timezone,
1670 the same number will print both times. However, if the processor
1671 backend uses a COPY reloc, then actually timezone will be copied
1672 into your process image, and, since you define _timezone
1673 yourself, _timezone will not. Thus timezone and _timezone will
1674 wind up at different memory locations. The tzset call will set
1675 _timezone, leaving timezone unchanged. */
1677 if (h->weakdef != NULL)
1679 struct elf_link_hash_entry *weakdef;
1681 BFD_ASSERT (h->root.type == bfd_link_hash_defined
1682 || h->root.type == bfd_link_hash_defweak);
1683 weakdef = h->weakdef;
1684 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
1685 || weakdef->root.type == bfd_link_hash_defweak);
1686 BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC);
1687 if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
1689 /* This symbol is defined by a regular object file, so we
1690 will not do anything special. Clear weakdef for the
1691 convenience of the processor backend. */
1696 /* There is an implicit reference by a regular object file
1697 via the weak symbol. */
1698 weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
1699 if (! elf_adjust_dynamic_symbol (weakdef, (PTR) eif))
1704 dynobj = elf_hash_table (eif->info)->dynobj;
1705 bed = get_elf_backend_data (dynobj);
1706 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
1715 /* Final phase of ELF linker. */
1717 /* A structure we use to avoid passing large numbers of arguments. */
1719 struct elf_final_link_info
1721 /* General link information. */
1722 struct bfd_link_info *info;
1725 /* Symbol string table. */
1726 struct bfd_strtab_hash *symstrtab;
1727 /* .dynsym section. */
1728 asection *dynsym_sec;
1729 /* .hash section. */
1731 /* Buffer large enough to hold contents of any section. */
1733 /* Buffer large enough to hold external relocs of any section. */
1734 PTR external_relocs;
1735 /* Buffer large enough to hold internal relocs of any section. */
1736 Elf_Internal_Rela *internal_relocs;
1737 /* Buffer large enough to hold external local symbols of any input
1739 Elf_External_Sym *external_syms;
1740 /* Buffer large enough to hold internal local symbols of any input
1742 Elf_Internal_Sym *internal_syms;
1743 /* Array large enough to hold a symbol index for each local symbol
1744 of any input BFD. */
1746 /* Array large enough to hold a section pointer for each local
1747 symbol of any input BFD. */
1748 asection **sections;
1749 /* Buffer to hold swapped out symbols. */
1750 Elf_External_Sym *symbuf;
1751 /* Number of swapped out symbols in buffer. */
1752 size_t symbuf_count;
1753 /* Number of symbols which fit in symbuf. */
1757 static boolean elf_link_output_sym
1758 PARAMS ((struct elf_final_link_info *, const char *,
1759 Elf_Internal_Sym *, asection *));
1760 static boolean elf_link_flush_output_syms
1761 PARAMS ((struct elf_final_link_info *));
1762 static boolean elf_link_output_extsym
1763 PARAMS ((struct elf_link_hash_entry *, PTR));
1764 static boolean elf_link_input_bfd
1765 PARAMS ((struct elf_final_link_info *, bfd *));
1766 static boolean elf_reloc_link_order
1767 PARAMS ((bfd *, struct bfd_link_info *, asection *,
1768 struct bfd_link_order *));
1770 /* This struct is used to pass information to routines called via
1771 elf_link_hash_traverse which must return failure. */
1773 struct elf_finfo_failed
1776 struct elf_final_link_info *finfo;
1779 /* Do the final step of an ELF link. */
1782 elf_bfd_final_link (abfd, info)
1784 struct bfd_link_info *info;
1788 struct elf_final_link_info finfo;
1789 register asection *o;
1790 register struct bfd_link_order *p;
1792 size_t max_contents_size;
1793 size_t max_external_reloc_size;
1794 size_t max_internal_reloc_count;
1795 size_t max_sym_count;
1797 Elf_Internal_Sym elfsym;
1799 Elf_Internal_Shdr *symtab_hdr;
1800 Elf_Internal_Shdr *symstrtab_hdr;
1801 struct elf_backend_data *bed = get_elf_backend_data (abfd);
1802 struct elf_finfo_failed eif;
1805 abfd->flags |= DYNAMIC;
1807 dynamic = elf_hash_table (info)->dynamic_sections_created;
1808 dynobj = elf_hash_table (info)->dynobj;
1811 finfo.output_bfd = abfd;
1812 finfo.symstrtab = elf_stringtab_init ();
1813 if (finfo.symstrtab == NULL)
1817 finfo.dynsym_sec = NULL;
1818 finfo.hash_sec = NULL;
1822 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
1823 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
1824 BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
1826 finfo.contents = NULL;
1827 finfo.external_relocs = NULL;
1828 finfo.internal_relocs = NULL;
1829 finfo.external_syms = NULL;
1830 finfo.internal_syms = NULL;
1831 finfo.indices = NULL;
1832 finfo.sections = NULL;
1833 finfo.symbuf = NULL;
1834 finfo.symbuf_count = 0;
1836 /* Count up the number of relocations we will output for each output
1837 section, so that we know the sizes of the reloc sections. We
1838 also figure out some maximum sizes. */
1839 max_contents_size = 0;
1840 max_external_reloc_size = 0;
1841 max_internal_reloc_count = 0;
1843 for (o = abfd->sections; o != (asection *) NULL; o = o->next)
1847 for (p = o->link_order_head; p != NULL; p = p->next)
1849 if (p->type == bfd_section_reloc_link_order
1850 || p->type == bfd_symbol_reloc_link_order)
1852 else if (p->type == bfd_indirect_link_order)
1856 sec = p->u.indirect.section;
1858 /* Mark all sections which are to be included in the
1859 link. This will normally be every section. We need
1860 to do this so that we can identify any sections which
1861 the linker has decided to not include. */
1862 sec->linker_mark = true;
1864 if (info->relocateable)
1865 o->reloc_count += sec->reloc_count;
1867 if (sec->_raw_size > max_contents_size)
1868 max_contents_size = sec->_raw_size;
1869 if (sec->_cooked_size > max_contents_size)
1870 max_contents_size = sec->_cooked_size;
1872 /* We are interested in just local symbols, not all
1874 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour)
1878 if (elf_bad_symtab (sec->owner))
1879 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
1880 / sizeof (Elf_External_Sym));
1882 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
1884 if (sym_count > max_sym_count)
1885 max_sym_count = sym_count;
1887 if ((sec->flags & SEC_RELOC) != 0)
1891 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
1892 if (ext_size > max_external_reloc_size)
1893 max_external_reloc_size = ext_size;
1894 if (sec->reloc_count > max_internal_reloc_count)
1895 max_internal_reloc_count = sec->reloc_count;
1901 if (o->reloc_count > 0)
1902 o->flags |= SEC_RELOC;
1905 /* Explicitly clear the SEC_RELOC flag. The linker tends to
1906 set it (this is probably a bug) and if it is set
1907 assign_section_numbers will create a reloc section. */
1908 o->flags &=~ SEC_RELOC;
1911 /* If the SEC_ALLOC flag is not set, force the section VMA to
1912 zero. This is done in elf_fake_sections as well, but forcing
1913 the VMA to 0 here will ensure that relocs against these
1914 sections are handled correctly. */
1915 if ((o->flags & SEC_ALLOC) == 0
1916 && ! o->user_set_vma)
1920 /* Figure out the file positions for everything but the symbol table
1921 and the relocs. We set symcount to force assign_section_numbers
1922 to create a symbol table. */
1923 abfd->symcount = info->strip == strip_all ? 0 : 1;
1924 BFD_ASSERT (! abfd->output_has_begun);
1925 if (! _bfd_elf_compute_section_file_positions (abfd, info))
1928 /* That created the reloc sections. Set their sizes, and assign
1929 them file positions, and allocate some buffers. */
1930 for (o = abfd->sections; o != NULL; o = o->next)
1932 if ((o->flags & SEC_RELOC) != 0)
1934 Elf_Internal_Shdr *rel_hdr;
1935 register struct elf_link_hash_entry **p, **pend;
1937 rel_hdr = &elf_section_data (o)->rel_hdr;
1939 rel_hdr->sh_size = rel_hdr->sh_entsize * o->reloc_count;
1941 /* The contents field must last into write_object_contents,
1942 so we allocate it with bfd_alloc rather than malloc. */
1943 rel_hdr->contents = (PTR) bfd_alloc (abfd, rel_hdr->sh_size);
1944 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
1947 p = ((struct elf_link_hash_entry **)
1948 bfd_malloc (o->reloc_count
1949 * sizeof (struct elf_link_hash_entry *)));
1950 if (p == NULL && o->reloc_count != 0)
1952 elf_section_data (o)->rel_hashes = p;
1953 pend = p + o->reloc_count;
1954 for (; p < pend; p++)
1957 /* Use the reloc_count field as an index when outputting the
1963 _bfd_elf_assign_file_positions_for_relocs (abfd);
1965 /* We have now assigned file positions for all the sections except
1966 .symtab and .strtab. We start the .symtab section at the current
1967 file position, and write directly to it. We build the .strtab
1968 section in memory. */
1970 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1971 /* sh_name is set in prep_headers. */
1972 symtab_hdr->sh_type = SHT_SYMTAB;
1973 symtab_hdr->sh_flags = 0;
1974 symtab_hdr->sh_addr = 0;
1975 symtab_hdr->sh_size = 0;
1976 symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
1977 /* sh_link is set in assign_section_numbers. */
1978 /* sh_info is set below. */
1979 /* sh_offset is set just below. */
1980 symtab_hdr->sh_addralign = 4; /* FIXME: system dependent? */
1982 off = elf_tdata (abfd)->next_file_pos;
1983 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, true);
1985 /* Note that at this point elf_tdata (abfd)->next_file_pos is
1986 incorrect. We do not yet know the size of the .symtab section.
1987 We correct next_file_pos below, after we do know the size. */
1989 /* Allocate a buffer to hold swapped out symbols. This is to avoid
1990 continuously seeking to the right position in the file. */
1991 if (! info->keep_memory || max_sym_count < 20)
1992 finfo.symbuf_size = 20;
1994 finfo.symbuf_size = max_sym_count;
1995 finfo.symbuf = ((Elf_External_Sym *)
1996 bfd_malloc (finfo.symbuf_size * sizeof (Elf_External_Sym)));
1997 if (finfo.symbuf == NULL)
2000 /* Start writing out the symbol table. The first symbol is always a
2002 if (info->strip != strip_all || info->relocateable)
2004 elfsym.st_value = 0;
2007 elfsym.st_other = 0;
2008 elfsym.st_shndx = SHN_UNDEF;
2009 if (! elf_link_output_sym (&finfo, (const char *) NULL,
2010 &elfsym, bfd_und_section_ptr))
2015 /* Some standard ELF linkers do this, but we don't because it causes
2016 bootstrap comparison failures. */
2017 /* Output a file symbol for the output file as the second symbol.
2018 We output this even if we are discarding local symbols, although
2019 I'm not sure if this is correct. */
2020 elfsym.st_value = 0;
2022 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
2023 elfsym.st_other = 0;
2024 elfsym.st_shndx = SHN_ABS;
2025 if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
2026 &elfsym, bfd_abs_section_ptr))
2030 /* Output a symbol for each section. We output these even if we are
2031 discarding local symbols, since they are used for relocs. These
2032 symbols have no names. We store the index of each one in the
2033 index field of the section, so that we can find it again when
2034 outputting relocs. */
2035 if (info->strip != strip_all || info->relocateable)
2037 elfsym.st_value = 0;
2039 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
2040 elfsym.st_other = 0;
2041 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
2043 o = section_from_elf_index (abfd, i);
2045 o->target_index = abfd->symcount;
2046 elfsym.st_shndx = i;
2047 if (! elf_link_output_sym (&finfo, (const char *) NULL,
2053 /* Allocate some memory to hold information read in from the input
2055 finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
2056 finfo.external_relocs = (PTR) bfd_malloc (max_external_reloc_size);
2057 finfo.internal_relocs = ((Elf_Internal_Rela *)
2058 bfd_malloc (max_internal_reloc_count
2059 * sizeof (Elf_Internal_Rela)));
2060 finfo.external_syms = ((Elf_External_Sym *)
2061 bfd_malloc (max_sym_count
2062 * sizeof (Elf_External_Sym)));
2063 finfo.internal_syms = ((Elf_Internal_Sym *)
2064 bfd_malloc (max_sym_count
2065 * sizeof (Elf_Internal_Sym)));
2066 finfo.indices = (long *) bfd_malloc (max_sym_count * sizeof (long));
2067 finfo.sections = ((asection **)
2068 bfd_malloc (max_sym_count * sizeof (asection *)));
2069 if ((finfo.contents == NULL && max_contents_size != 0)
2070 || (finfo.external_relocs == NULL && max_external_reloc_size != 0)
2071 || (finfo.internal_relocs == NULL && max_internal_reloc_count != 0)
2072 || (finfo.external_syms == NULL && max_sym_count != 0)
2073 || (finfo.internal_syms == NULL && max_sym_count != 0)
2074 || (finfo.indices == NULL && max_sym_count != 0)
2075 || (finfo.sections == NULL && max_sym_count != 0))
2078 /* Since ELF permits relocations to be against local symbols, we
2079 must have the local symbols available when we do the relocations.
2080 Since we would rather only read the local symbols once, and we
2081 would rather not keep them in memory, we handle all the
2082 relocations for a single input file at the same time.
2084 Unfortunately, there is no way to know the total number of local
2085 symbols until we have seen all of them, and the local symbol
2086 indices precede the global symbol indices. This means that when
2087 we are generating relocateable output, and we see a reloc against
2088 a global symbol, we can not know the symbol index until we have
2089 finished examining all the local symbols to see which ones we are
2090 going to output. To deal with this, we keep the relocations in
2091 memory, and don't output them until the end of the link. This is
2092 an unfortunate waste of memory, but I don't see a good way around
2093 it. Fortunately, it only happens when performing a relocateable
2094 link, which is not the common case. FIXME: If keep_memory is set
2095 we could write the relocs out and then read them again; I don't
2096 know how bad the memory loss will be. */
2098 for (sub = info->input_bfds; sub != NULL; sub = sub->next)
2099 sub->output_has_begun = false;
2100 for (o = abfd->sections; o != NULL; o = o->next)
2102 for (p = o->link_order_head; p != NULL; p = p->next)
2104 if (p->type == bfd_indirect_link_order
2105 && (bfd_get_flavour (p->u.indirect.section->owner)
2106 == bfd_target_elf_flavour))
2108 sub = p->u.indirect.section->owner;
2109 if (! sub->output_has_begun)
2111 if (! elf_link_input_bfd (&finfo, sub))
2113 sub->output_has_begun = true;
2116 else if (p->type == bfd_section_reloc_link_order
2117 || p->type == bfd_symbol_reloc_link_order)
2119 if (! elf_reloc_link_order (abfd, info, o, p))
2124 if (! _bfd_default_link_order (abfd, info, o, p))
2130 /* That wrote out all the local symbols. Finish up the symbol table
2131 with the global symbols. */
2133 /* The sh_info field records the index of the first non local
2135 symtab_hdr->sh_info = abfd->symcount;
2137 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info = 1;
2139 /* We get the global symbols from the hash table. */
2142 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
2147 /* Flush all symbols to the file. */
2148 if (! elf_link_flush_output_syms (&finfo))
2151 /* Now we know the size of the symtab section. */
2152 off += symtab_hdr->sh_size;
2154 /* Finish up and write out the symbol string table (.strtab)
2156 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
2157 /* sh_name was set in prep_headers. */
2158 symstrtab_hdr->sh_type = SHT_STRTAB;
2159 symstrtab_hdr->sh_flags = 0;
2160 symstrtab_hdr->sh_addr = 0;
2161 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
2162 symstrtab_hdr->sh_entsize = 0;
2163 symstrtab_hdr->sh_link = 0;
2164 symstrtab_hdr->sh_info = 0;
2165 /* sh_offset is set just below. */
2166 symstrtab_hdr->sh_addralign = 1;
2168 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, true);
2169 elf_tdata (abfd)->next_file_pos = off;
2171 if (abfd->symcount > 0)
2173 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
2174 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
2178 /* Adjust the relocs to have the correct symbol indices. */
2179 for (o = abfd->sections; o != NULL; o = o->next)
2181 struct elf_link_hash_entry **rel_hash;
2182 Elf_Internal_Shdr *rel_hdr;
2184 if ((o->flags & SEC_RELOC) == 0)
2187 rel_hash = elf_section_data (o)->rel_hashes;
2188 rel_hdr = &elf_section_data (o)->rel_hdr;
2189 for (i = 0; i < o->reloc_count; i++, rel_hash++)
2191 if (*rel_hash == NULL)
2194 BFD_ASSERT ((*rel_hash)->indx >= 0);
2196 if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
2198 Elf_External_Rel *erel;
2199 Elf_Internal_Rel irel;
2201 erel = (Elf_External_Rel *) rel_hdr->contents + i;
2202 elf_swap_reloc_in (abfd, erel, &irel);
2203 irel.r_info = ELF_R_INFO ((*rel_hash)->indx,
2204 ELF_R_TYPE (irel.r_info));
2205 elf_swap_reloc_out (abfd, &irel, erel);
2209 Elf_External_Rela *erela;
2210 Elf_Internal_Rela irela;
2212 BFD_ASSERT (rel_hdr->sh_entsize
2213 == sizeof (Elf_External_Rela));
2215 erela = (Elf_External_Rela *) rel_hdr->contents + i;
2216 elf_swap_reloca_in (abfd, erela, &irela);
2217 irela.r_info = ELF_R_INFO ((*rel_hash)->indx,
2218 ELF_R_TYPE (irela.r_info));
2219 elf_swap_reloca_out (abfd, &irela, erela);
2223 /* Set the reloc_count field to 0 to prevent write_relocs from
2224 trying to swap the relocs out itself. */
2228 /* If we are linking against a dynamic object, or generating a
2229 shared library, finish up the dynamic linking information. */
2232 Elf_External_Dyn *dyncon, *dynconend;
2234 /* Fix up .dynamic entries. */
2235 o = bfd_get_section_by_name (dynobj, ".dynamic");
2236 BFD_ASSERT (o != NULL);
2238 dyncon = (Elf_External_Dyn *) o->contents;
2239 dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size);
2240 for (; dyncon < dynconend; dyncon++)
2242 Elf_Internal_Dyn dyn;
2246 elf_swap_dyn_in (dynobj, dyncon, &dyn);
2253 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
2254 magic _init and _fini symbols. This is pretty ugly,
2255 but we are compatible. */
2263 struct elf_link_hash_entry *h;
2265 h = elf_link_hash_lookup (elf_hash_table (info), name,
2266 false, false, true);
2268 && (h->root.type == bfd_link_hash_defined
2269 || h->root.type == bfd_link_hash_defweak))
2271 dyn.d_un.d_val = h->root.u.def.value;
2272 o = h->root.u.def.section;
2273 if (o->output_section != NULL)
2274 dyn.d_un.d_val += (o->output_section->vma
2275 + o->output_offset);
2278 /* The symbol is imported from another shared
2279 library and does not apply to this one. */
2283 elf_swap_dyn_out (dynobj, &dyn, dyncon);
2297 o = bfd_get_section_by_name (abfd, name);
2298 BFD_ASSERT (o != NULL);
2299 dyn.d_un.d_ptr = o->vma;
2300 elf_swap_dyn_out (dynobj, &dyn, dyncon);
2307 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
2312 for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++)
2314 Elf_Internal_Shdr *hdr;
2316 hdr = elf_elfsections (abfd)[i];
2317 if (hdr->sh_type == type
2318 && (hdr->sh_flags & SHF_ALLOC) != 0)
2320 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
2321 dyn.d_un.d_val += hdr->sh_size;
2324 if (dyn.d_un.d_val == 0
2325 || hdr->sh_addr < dyn.d_un.d_val)
2326 dyn.d_un.d_val = hdr->sh_addr;
2330 elf_swap_dyn_out (dynobj, &dyn, dyncon);
2336 /* If we have created any dynamic sections, then output them. */
2339 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
2342 for (o = dynobj->sections; o != NULL; o = o->next)
2344 if ((o->flags & SEC_HAS_CONTENTS) == 0
2345 || o->_raw_size == 0)
2347 if ((o->flags & SEC_IN_MEMORY) == 0)
2349 /* At this point, we are only interested in sections
2350 created by elf_link_create_dynamic_sections. FIXME:
2351 This test is fragile. */
2354 if ((elf_section_data (o->output_section)->this_hdr.sh_type
2356 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
2358 if (! bfd_set_section_contents (abfd, o->output_section,
2359 o->contents, o->output_offset,
2367 /* The contents of the .dynstr section are actually in a
2369 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
2370 if (bfd_seek (abfd, off, SEEK_SET) != 0
2371 || ! _bfd_stringtab_emit (abfd,
2372 elf_hash_table (info)->dynstr))
2378 /* If we have optimized stabs strings, output them. */
2379 if (elf_hash_table (info)->stab_info != NULL)
2381 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
2385 if (finfo.symstrtab != NULL)
2386 _bfd_stringtab_free (finfo.symstrtab);
2387 if (finfo.contents != NULL)
2388 free (finfo.contents);
2389 if (finfo.external_relocs != NULL)
2390 free (finfo.external_relocs);
2391 if (finfo.internal_relocs != NULL)
2392 free (finfo.internal_relocs);
2393 if (finfo.external_syms != NULL)
2394 free (finfo.external_syms);
2395 if (finfo.internal_syms != NULL)
2396 free (finfo.internal_syms);
2397 if (finfo.indices != NULL)
2398 free (finfo.indices);
2399 if (finfo.sections != NULL)
2400 free (finfo.sections);
2401 if (finfo.symbuf != NULL)
2402 free (finfo.symbuf);
2403 for (o = abfd->sections; o != NULL; o = o->next)
2405 if ((o->flags & SEC_RELOC) != 0
2406 && elf_section_data (o)->rel_hashes != NULL)
2407 free (elf_section_data (o)->rel_hashes);
2410 elf_tdata (abfd)->linker = true;
2415 if (finfo.symstrtab != NULL)
2416 _bfd_stringtab_free (finfo.symstrtab);
2417 if (finfo.contents != NULL)
2418 free (finfo.contents);
2419 if (finfo.external_relocs != NULL)
2420 free (finfo.external_relocs);
2421 if (finfo.internal_relocs != NULL)
2422 free (finfo.internal_relocs);
2423 if (finfo.external_syms != NULL)
2424 free (finfo.external_syms);
2425 if (finfo.internal_syms != NULL)
2426 free (finfo.internal_syms);
2427 if (finfo.indices != NULL)
2428 free (finfo.indices);
2429 if (finfo.sections != NULL)
2430 free (finfo.sections);
2431 if (finfo.symbuf != NULL)
2432 free (finfo.symbuf);
2433 for (o = abfd->sections; o != NULL; o = o->next)
2435 if ((o->flags & SEC_RELOC) != 0
2436 && elf_section_data (o)->rel_hashes != NULL)
2437 free (elf_section_data (o)->rel_hashes);
2443 /* Add a symbol to the output symbol table. */
2446 elf_link_output_sym (finfo, name, elfsym, input_sec)
2447 struct elf_final_link_info *finfo;
2449 Elf_Internal_Sym *elfsym;
2450 asection *input_sec;
2452 boolean (*output_symbol_hook) PARAMS ((bfd *,
2453 struct bfd_link_info *info,
2458 output_symbol_hook = get_elf_backend_data (finfo->output_bfd)->
2459 elf_backend_link_output_symbol_hook;
2460 if (output_symbol_hook != NULL)
2462 if (! ((*output_symbol_hook)
2463 (finfo->output_bfd, finfo->info, name, elfsym, input_sec)))
2467 if (name == (const char *) NULL || *name == '\0')
2468 elfsym->st_name = 0;
2471 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
2474 if (elfsym->st_name == (unsigned long) -1)
2478 if (finfo->symbuf_count >= finfo->symbuf_size)
2480 if (! elf_link_flush_output_syms (finfo))
2484 elf_swap_symbol_out (finfo->output_bfd, elfsym,
2485 (PTR) (finfo->symbuf + finfo->symbuf_count));
2486 ++finfo->symbuf_count;
2488 ++finfo->output_bfd->symcount;
2493 /* Flush the output symbols to the file. */
2496 elf_link_flush_output_syms (finfo)
2497 struct elf_final_link_info *finfo;
2499 if (finfo->symbuf_count > 0)
2501 Elf_Internal_Shdr *symtab;
2503 symtab = &elf_tdata (finfo->output_bfd)->symtab_hdr;
2505 if (bfd_seek (finfo->output_bfd, symtab->sh_offset + symtab->sh_size,
2507 || (bfd_write ((PTR) finfo->symbuf, finfo->symbuf_count,
2508 sizeof (Elf_External_Sym), finfo->output_bfd)
2509 != finfo->symbuf_count * sizeof (Elf_External_Sym)))
2512 symtab->sh_size += finfo->symbuf_count * sizeof (Elf_External_Sym);
2514 finfo->symbuf_count = 0;
2520 /* Add an external symbol to the symbol table. This is called from
2521 the hash table traversal routine. */
2524 elf_link_output_extsym (h, data)
2525 struct elf_link_hash_entry *h;
2528 struct elf_finfo_failed *eif = (struct elf_finfo_failed *) data;
2529 struct elf_final_link_info *finfo = eif->finfo;
2531 Elf_Internal_Sym sym;
2532 asection *input_sec;
2534 /* If we are not creating a shared library, and this symbol is
2535 referenced by a shared library but is not defined anywhere, then
2536 warn that it is undefined. If we do not do this, the runtime
2537 linker will complain that the symbol is undefined when the
2538 program is run. We don't have to worry about symbols that are
2539 referenced by regular files, because we will already have issued
2540 warnings for them. */
2541 if (! finfo->info->relocateable
2542 && ! finfo->info->shared
2543 && h->root.type == bfd_link_hash_undefined
2544 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
2545 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
2547 if (! ((*finfo->info->callbacks->undefined_symbol)
2548 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
2549 (asection *) NULL, 0)))
2556 /* We don't want to output symbols that have never been mentioned by
2557 a regular file, or that we have been told to strip. However, if
2558 h->indx is set to -2, the symbol is used by a reloc and we must
2562 else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2563 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
2564 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
2565 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
2567 else if (finfo->info->strip == strip_all
2568 || (finfo->info->strip == strip_some
2569 && bfd_hash_lookup (finfo->info->keep_hash,
2570 h->root.root.string,
2571 false, false) == NULL))
2576 /* If we're stripping it, and it's not a dynamic symbol, there's
2577 nothing else to do. */
2578 if (strip && h->dynindx == -1)
2582 sym.st_size = h->size;
2583 sym.st_other = h->other;
2584 if (h->root.type == bfd_link_hash_undefweak
2585 || h->root.type == bfd_link_hash_defweak)
2586 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
2588 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
2590 switch (h->root.type)
2593 case bfd_link_hash_new:
2597 case bfd_link_hash_undefined:
2598 input_sec = bfd_und_section_ptr;
2599 sym.st_shndx = SHN_UNDEF;
2602 case bfd_link_hash_undefweak:
2603 input_sec = bfd_und_section_ptr;
2604 sym.st_shndx = SHN_UNDEF;
2607 case bfd_link_hash_defined:
2608 case bfd_link_hash_defweak:
2610 input_sec = h->root.u.def.section;
2611 if (input_sec->output_section != NULL)
2614 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
2615 input_sec->output_section);
2616 if (sym.st_shndx == (unsigned short) -1)
2622 /* ELF symbols in relocateable files are section relative,
2623 but in nonrelocateable files they are virtual
2625 sym.st_value = h->root.u.def.value + input_sec->output_offset;
2626 if (! finfo->info->relocateable)
2627 sym.st_value += input_sec->output_section->vma;
2631 BFD_ASSERT ((bfd_get_flavour (input_sec->owner)
2632 == bfd_target_elf_flavour)
2633 && elf_elfheader (input_sec->owner)->e_type == ET_DYN);
2634 sym.st_shndx = SHN_UNDEF;
2635 input_sec = bfd_und_section_ptr;
2640 case bfd_link_hash_common:
2641 input_sec = bfd_com_section_ptr;
2642 sym.st_shndx = SHN_COMMON;
2643 sym.st_value = 1 << h->root.u.c.p->alignment_power;
2646 case bfd_link_hash_indirect:
2647 case bfd_link_hash_warning:
2648 /* We can't represent these symbols in ELF. A warning symbol
2649 may have come from a .gnu.warning.SYMBOL section anyhow. We
2650 just put the target symbol in the hash table. If the target
2651 symbol does not really exist, don't do anything. */
2652 if (h->root.u.i.link->type == bfd_link_hash_new)
2654 return (elf_link_output_extsym
2655 ((struct elf_link_hash_entry *) h->root.u.i.link, data));
2658 /* If this symbol should be put in the .dynsym section, then put it
2659 there now. We have already know the symbol index. We also fill
2660 in the entry in the .hash section. */
2661 if (h->dynindx != -1
2662 && elf_hash_table (finfo->info)->dynamic_sections_created)
2664 struct elf_backend_data *bed;
2667 bfd_byte *bucketpos;
2670 sym.st_name = h->dynstr_index;
2672 /* Give the processor backend a chance to tweak the symbol
2673 value, and also to finish up anything that needs to be done
2675 bed = get_elf_backend_data (finfo->output_bfd);
2676 if (! ((*bed->elf_backend_finish_dynamic_symbol)
2677 (finfo->output_bfd, finfo->info, h, &sym)))
2683 elf_swap_symbol_out (finfo->output_bfd, &sym,
2684 (PTR) (((Elf_External_Sym *)
2685 finfo->dynsym_sec->contents)
2688 bucketcount = elf_hash_table (finfo->info)->bucketcount;
2689 bucket = (bfd_elf_hash ((const unsigned char *) h->root.root.string)
2691 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
2692 + (bucket + 2) * (ARCH_SIZE / 8));
2693 chain = get_word (finfo->output_bfd, bucketpos);
2694 put_word (finfo->output_bfd, h->dynindx, bucketpos);
2695 put_word (finfo->output_bfd, chain,
2696 ((bfd_byte *) finfo->hash_sec->contents
2697 + (bucketcount + 2 + h->dynindx) * (ARCH_SIZE / 8)));
2700 /* If we're stripping it, then it was just a dynamic symbol, and
2701 there's nothing else to do. */
2705 h->indx = finfo->output_bfd->symcount;
2707 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec))
2716 /* Link an input file into the linker output file. This function
2717 handles all the sections and relocations of the input file at once.
2718 This is so that we only have to read the local symbols once, and
2719 don't have to keep them in memory. */
2722 elf_link_input_bfd (finfo, input_bfd)
2723 struct elf_final_link_info *finfo;
2726 boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *,
2727 bfd *, asection *, bfd_byte *,
2728 Elf_Internal_Rela *,
2729 Elf_Internal_Sym *, asection **));
2731 Elf_Internal_Shdr *symtab_hdr;
2734 Elf_External_Sym *external_syms;
2735 Elf_External_Sym *esym;
2736 Elf_External_Sym *esymend;
2737 Elf_Internal_Sym *isym;
2739 asection **ppsection;
2742 output_bfd = finfo->output_bfd;
2744 get_elf_backend_data (output_bfd)->elf_backend_relocate_section;
2746 /* If this is a dynamic object, we don't want to do anything here:
2747 we don't want the local symbols, and we don't want the section
2749 if (elf_elfheader (input_bfd)->e_type == ET_DYN)
2752 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2753 if (elf_bad_symtab (input_bfd))
2755 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
2760 locsymcount = symtab_hdr->sh_info;
2761 extsymoff = symtab_hdr->sh_info;
2764 /* Read the local symbols. */
2765 if (symtab_hdr->contents != NULL)
2766 external_syms = (Elf_External_Sym *) symtab_hdr->contents;
2767 else if (locsymcount == 0)
2768 external_syms = NULL;
2771 external_syms = finfo->external_syms;
2772 if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
2773 || (bfd_read (external_syms, sizeof (Elf_External_Sym),
2774 locsymcount, input_bfd)
2775 != locsymcount * sizeof (Elf_External_Sym)))
2779 /* Swap in the local symbols and write out the ones which we know
2780 are going into the output file. */
2781 esym = external_syms;
2782 esymend = esym + locsymcount;
2783 isym = finfo->internal_syms;
2784 pindex = finfo->indices;
2785 ppsection = finfo->sections;
2786 for (; esym < esymend; esym++, isym++, pindex++, ppsection++)
2790 Elf_Internal_Sym osym;
2792 elf_swap_symbol_in (input_bfd, esym, isym);
2795 if (elf_bad_symtab (input_bfd))
2797 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
2804 if (isym->st_shndx == SHN_UNDEF)
2805 isec = bfd_und_section_ptr;
2806 else if (isym->st_shndx > 0 && isym->st_shndx < SHN_LORESERVE)
2807 isec = section_from_elf_index (input_bfd, isym->st_shndx);
2808 else if (isym->st_shndx == SHN_ABS)
2809 isec = bfd_abs_section_ptr;
2810 else if (isym->st_shndx == SHN_COMMON)
2811 isec = bfd_com_section_ptr;
2820 /* Don't output the first, undefined, symbol. */
2821 if (esym == external_syms)
2824 /* If we are stripping all symbols, we don't want to output this
2826 if (finfo->info->strip == strip_all)
2829 /* We never output section symbols. Instead, we use the section
2830 symbol of the corresponding section in the output file. */
2831 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
2834 /* If we are discarding all local symbols, we don't want to
2835 output this one. If we are generating a relocateable output
2836 file, then some of the local symbols may be required by
2837 relocs; we output them below as we discover that they are
2839 if (finfo->info->discard == discard_all)
2842 /* Get the name of the symbol. */
2843 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
2848 /* See if we are discarding symbols with this name. */
2849 if ((finfo->info->strip == strip_some
2850 && (bfd_hash_lookup (finfo->info->keep_hash, name, false, false)
2852 || (finfo->info->discard == discard_l
2853 && strncmp (name, finfo->info->lprefix,
2854 finfo->info->lprefix_len) == 0))
2857 /* If we get here, we are going to output this symbol. */
2861 /* Adjust the section index for the output file. */
2862 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
2863 isec->output_section);
2864 if (osym.st_shndx == (unsigned short) -1)
2867 *pindex = output_bfd->symcount;
2869 /* ELF symbols in relocateable files are section relative, but
2870 in executable files they are virtual addresses. Note that
2871 this code assumes that all ELF sections have an associated
2872 BFD section with a reasonable value for output_offset; below
2873 we assume that they also have a reasonable value for
2874 output_section. Any special sections must be set up to meet
2875 these requirements. */
2876 osym.st_value += isec->output_offset;
2877 if (! finfo->info->relocateable)
2878 osym.st_value += isec->output_section->vma;
2880 if (! elf_link_output_sym (finfo, name, &osym, isec))
2884 /* Relocate the contents of each section. */
2885 for (o = input_bfd->sections; o != NULL; o = o->next)
2889 if (! o->linker_mark)
2891 /* This section was omitted from the link. */
2895 if ((o->flags & SEC_HAS_CONTENTS) == 0
2896 || (o->_raw_size == 0 && (o->flags & SEC_RELOC) == 0))
2899 if ((o->flags & SEC_IN_MEMORY) != 0
2900 && input_bfd == elf_hash_table (finfo->info)->dynobj)
2902 /* Section was created by elf_link_create_dynamic_sections.
2903 FIXME: This test is fragile. */
2907 /* Get the contents of the section. They have been cached by a
2908 relaxation routine. Note that o is a section in an input
2909 file, so the contents field will not have been set by any of
2910 the routines which work on output files. */
2911 if (elf_section_data (o)->this_hdr.contents != NULL)
2912 contents = elf_section_data (o)->this_hdr.contents;
2915 contents = finfo->contents;
2916 if (! bfd_get_section_contents (input_bfd, o, contents,
2917 (file_ptr) 0, o->_raw_size))
2921 if ((o->flags & SEC_RELOC) != 0)
2923 Elf_Internal_Rela *internal_relocs;
2925 /* Get the swapped relocs. */
2926 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
2927 (input_bfd, o, finfo->external_relocs,
2928 finfo->internal_relocs, false));
2929 if (internal_relocs == NULL
2930 && o->reloc_count > 0)
2933 /* Relocate the section by invoking a back end routine.
2935 The back end routine is responsible for adjusting the
2936 section contents as necessary, and (if using Rela relocs
2937 and generating a relocateable output file) adjusting the
2938 reloc addend as necessary.
2940 The back end routine does not have to worry about setting
2941 the reloc address or the reloc symbol index.
2943 The back end routine is given a pointer to the swapped in
2944 internal symbols, and can access the hash table entries
2945 for the external symbols via elf_sym_hashes (input_bfd).
2947 When generating relocateable output, the back end routine
2948 must handle STB_LOCAL/STT_SECTION symbols specially. The
2949 output symbol is going to be a section symbol
2950 corresponding to the output section, which will require
2951 the addend to be adjusted. */
2953 if (! (*relocate_section) (output_bfd, finfo->info,
2954 input_bfd, o, contents,
2956 finfo->internal_syms,
2960 if (finfo->info->relocateable)
2962 Elf_Internal_Rela *irela;
2963 Elf_Internal_Rela *irelaend;
2964 struct elf_link_hash_entry **rel_hash;
2965 Elf_Internal_Shdr *input_rel_hdr;
2966 Elf_Internal_Shdr *output_rel_hdr;
2968 /* Adjust the reloc addresses and symbol indices. */
2970 irela = internal_relocs;
2971 irelaend = irela + o->reloc_count;
2972 rel_hash = (elf_section_data (o->output_section)->rel_hashes
2973 + o->output_section->reloc_count);
2974 for (; irela < irelaend; irela++, rel_hash++)
2976 unsigned long r_symndx;
2977 Elf_Internal_Sym *isym;
2980 irela->r_offset += o->output_offset;
2982 r_symndx = ELF_R_SYM (irela->r_info);
2987 if (r_symndx >= locsymcount
2988 || (elf_bad_symtab (input_bfd)
2989 && finfo->sections[r_symndx] == NULL))
2993 /* This is a reloc against a global symbol. We
2994 have not yet output all the local symbols, so
2995 we do not know the symbol index of any global
2996 symbol. We set the rel_hash entry for this
2997 reloc to point to the global hash table entry
2998 for this symbol. The symbol index is then
2999 set at the end of elf_bfd_final_link. */
3000 indx = r_symndx - extsymoff;
3001 *rel_hash = elf_sym_hashes (input_bfd)[indx];
3003 /* Setting the index to -2 tells
3004 elf_link_output_extsym that this symbol is
3006 BFD_ASSERT ((*rel_hash)->indx < 0);
3007 (*rel_hash)->indx = -2;
3012 /* This is a reloc against a local symbol. */
3015 isym = finfo->internal_syms + r_symndx;
3016 sec = finfo->sections[r_symndx];
3017 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
3019 /* I suppose the backend ought to fill in the
3020 section of any STT_SECTION symbol against a
3021 processor specific section. */
3022 if (sec != NULL && bfd_is_abs_section (sec))
3024 else if (sec == NULL || sec->owner == NULL)
3026 bfd_set_error (bfd_error_bad_value);
3031 r_symndx = sec->output_section->target_index;
3032 BFD_ASSERT (r_symndx != 0);
3037 if (finfo->indices[r_symndx] == -1)
3043 if (finfo->info->strip == strip_all)
3045 /* You can't do ld -r -s. */
3046 bfd_set_error (bfd_error_invalid_operation);
3050 /* This symbol was skipped earlier, but
3051 since it is needed by a reloc, we
3052 must output it now. */
3053 link = symtab_hdr->sh_link;
3054 name = bfd_elf_string_from_elf_section (input_bfd,
3060 osec = sec->output_section;
3062 _bfd_elf_section_from_bfd_section (output_bfd,
3064 if (isym->st_shndx == (unsigned short) -1)
3067 isym->st_value += sec->output_offset;
3068 if (! finfo->info->relocateable)
3069 isym->st_value += osec->vma;
3071 finfo->indices[r_symndx] = output_bfd->symcount;
3073 if (! elf_link_output_sym (finfo, name, isym, sec))
3077 r_symndx = finfo->indices[r_symndx];
3080 irela->r_info = ELF_R_INFO (r_symndx,
3081 ELF_R_TYPE (irela->r_info));
3084 /* Swap out the relocs. */
3085 input_rel_hdr = &elf_section_data (o)->rel_hdr;
3086 output_rel_hdr = &elf_section_data (o->output_section)->rel_hdr;
3087 BFD_ASSERT (output_rel_hdr->sh_entsize
3088 == input_rel_hdr->sh_entsize);
3089 irela = internal_relocs;
3090 irelaend = irela + o->reloc_count;
3091 if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
3093 Elf_External_Rel *erel;
3095 erel = ((Elf_External_Rel *) output_rel_hdr->contents
3096 + o->output_section->reloc_count);
3097 for (; irela < irelaend; irela++, erel++)
3099 Elf_Internal_Rel irel;
3101 irel.r_offset = irela->r_offset;
3102 irel.r_info = irela->r_info;
3103 BFD_ASSERT (irela->r_addend == 0);
3104 elf_swap_reloc_out (output_bfd, &irel, erel);
3109 Elf_External_Rela *erela;
3111 BFD_ASSERT (input_rel_hdr->sh_entsize
3112 == sizeof (Elf_External_Rela));
3113 erela = ((Elf_External_Rela *) output_rel_hdr->contents
3114 + o->output_section->reloc_count);
3115 for (; irela < irelaend; irela++, erela++)
3116 elf_swap_reloca_out (output_bfd, irela, erela);
3119 o->output_section->reloc_count += o->reloc_count;
3123 /* Write out the modified section contents. */
3124 if (elf_section_data (o)->stab_info == NULL)
3126 if (! bfd_set_section_contents (output_bfd, o->output_section,
3127 contents, o->output_offset,
3128 (o->_cooked_size != 0
3135 if (! _bfd_write_section_stabs (output_bfd, o,
3136 &elf_section_data (o)->stab_info,
3145 /* Generate a reloc when linking an ELF file. This is a reloc
3146 requested by the linker, and does come from any input file. This
3147 is used to build constructor and destructor tables when linking
3151 elf_reloc_link_order (output_bfd, info, output_section, link_order)
3153 struct bfd_link_info *info;
3154 asection *output_section;
3155 struct bfd_link_order *link_order;
3157 reloc_howto_type *howto;
3161 struct elf_link_hash_entry **rel_hash_ptr;
3162 Elf_Internal_Shdr *rel_hdr;
3164 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
3167 bfd_set_error (bfd_error_bad_value);
3171 addend = link_order->u.reloc.p->addend;
3173 /* Figure out the symbol index. */
3174 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
3175 + output_section->reloc_count);
3176 if (link_order->type == bfd_section_reloc_link_order)
3178 indx = link_order->u.reloc.p->u.section->target_index;
3179 BFD_ASSERT (indx != 0);
3180 *rel_hash_ptr = NULL;
3184 struct elf_link_hash_entry *h;
3186 /* Treat a reloc against a defined symbol as though it were
3187 actually against the section. */
3188 h = ((struct elf_link_hash_entry *)
3189 bfd_wrapped_link_hash_lookup (output_bfd, info,
3190 link_order->u.reloc.p->u.name,
3191 false, false, true));
3193 && (h->root.type == bfd_link_hash_defined
3194 || h->root.type == bfd_link_hash_defweak))
3198 section = h->root.u.def.section;
3199 indx = section->output_section->target_index;
3200 *rel_hash_ptr = NULL;
3201 /* It seems that we ought to add the symbol value to the
3202 addend here, but in practice it has already been added
3203 because it was passed to constructor_callback. */
3204 addend += section->output_section->vma + section->output_offset;
3208 /* Setting the index to -2 tells elf_link_output_extsym that
3209 this symbol is used by a reloc. */
3216 if (! ((*info->callbacks->unattached_reloc)
3217 (info, link_order->u.reloc.p->u.name, (bfd *) NULL,
3218 (asection *) NULL, (bfd_vma) 0)))
3224 /* If this is an inplace reloc, we must write the addend into the
3226 if (howto->partial_inplace && addend != 0)
3229 bfd_reloc_status_type rstat;
3233 size = bfd_get_reloc_size (howto);
3234 buf = (bfd_byte *) bfd_zmalloc (size);
3235 if (buf == (bfd_byte *) NULL)
3237 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
3243 case bfd_reloc_outofrange:
3245 case bfd_reloc_overflow:
3246 if (! ((*info->callbacks->reloc_overflow)
3248 (link_order->type == bfd_section_reloc_link_order
3249 ? bfd_section_name (output_bfd,
3250 link_order->u.reloc.p->u.section)
3251 : link_order->u.reloc.p->u.name),
3252 howto->name, addend, (bfd *) NULL, (asection *) NULL,
3260 ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf,
3261 (file_ptr) link_order->offset, size);
3267 /* The address of a reloc is relative to the section in a
3268 relocateable file, and is a virtual address in an executable
3270 offset = link_order->offset;
3271 if (! info->relocateable)
3272 offset += output_section->vma;
3274 rel_hdr = &elf_section_data (output_section)->rel_hdr;
3276 if (rel_hdr->sh_type == SHT_REL)
3278 Elf_Internal_Rel irel;
3279 Elf_External_Rel *erel;
3281 irel.r_offset = offset;
3282 irel.r_info = ELF_R_INFO (indx, howto->type);
3283 erel = ((Elf_External_Rel *) rel_hdr->contents
3284 + output_section->reloc_count);
3285 elf_swap_reloc_out (output_bfd, &irel, erel);
3289 Elf_Internal_Rela irela;
3290 Elf_External_Rela *erela;
3292 irela.r_offset = offset;
3293 irela.r_info = ELF_R_INFO (indx, howto->type);
3294 irela.r_addend = addend;
3295 erela = ((Elf_External_Rela *) rel_hdr->contents
3296 + output_section->reloc_count);
3297 elf_swap_reloca_out (output_bfd, &irela, erela);
3300 ++output_section->reloc_count;
3306 /* Allocate a pointer to live in a linker created section. */
3309 elf_create_pointer_linker_section (abfd, info, lsect, h, rel)
3311 struct bfd_link_info *info;
3312 elf_linker_section_t *lsect;
3313 struct elf_link_hash_entry *h;
3314 const Elf_Internal_Rela *rel;
3316 elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL;
3317 elf_linker_section_pointers_t *linker_section_ptr;
3318 unsigned long r_symndx = ELF_R_SYM (rel->r_info);;
3320 BFD_ASSERT (lsect != NULL);
3322 /* Is this a global symbol? */
3325 /* Has this symbol already been allocated, if so, our work is done */
3326 if (_bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
3331 ptr_linker_section_ptr = &h->linker_section_pointer;
3332 /* Make sure this symbol is output as a dynamic symbol. */
3333 if (h->dynindx == -1)
3335 if (! elf_link_record_dynamic_symbol (info, h))
3339 if (lsect->rel_section)
3340 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
3343 else /* Allocation of a pointer to a local symbol */
3345 elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd);
3347 /* Allocate a table to hold the local symbols if first time */
3350 int num_symbols = elf_tdata (abfd)->symtab_hdr.sh_info;
3351 register unsigned int i;
3353 ptr = (elf_linker_section_pointers_t **)
3354 bfd_alloc (abfd, num_symbols * sizeof (elf_linker_section_pointers_t *));
3359 elf_local_ptr_offsets (abfd) = ptr;
3360 for (i = 0; i < num_symbols; i++)
3361 ptr[i] = (elf_linker_section_pointers_t *)0;
3364 /* Has this symbol already been allocated, if so, our work is done */
3365 if (_bfd_elf_find_pointer_linker_section (ptr[r_symndx],
3370 ptr_linker_section_ptr = &ptr[r_symndx];
3374 /* If we are generating a shared object, we need to
3375 output a R_<xxx>_RELATIVE reloc so that the
3376 dynamic linker can adjust this GOT entry. */
3377 BFD_ASSERT (lsect->rel_section != NULL);
3378 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
3382 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
3383 from internal memory. */
3384 BFD_ASSERT (ptr_linker_section_ptr != NULL);
3385 linker_section_ptr = (elf_linker_section_pointers_t *)
3386 bfd_alloc (abfd, sizeof (elf_linker_section_pointers_t));
3388 if (!linker_section_ptr)
3391 linker_section_ptr->next = *ptr_linker_section_ptr;
3392 linker_section_ptr->addend = rel->r_addend;
3393 linker_section_ptr->which = lsect->which;
3394 linker_section_ptr->written_address_p = false;
3395 *ptr_linker_section_ptr = linker_section_ptr;
3398 if (lsect->hole_size && lsect->hole_offset < lsect->max_hole_offset)
3400 linker_section_ptr->offset = lsect->section->_raw_size - lsect->hole_size + (ARCH_SIZE / 8);
3401 lsect->hole_offset += ARCH_SIZE / 8;
3402 lsect->sym_offset += ARCH_SIZE / 8;
3403 if (lsect->sym_hash) /* Bump up symbol value if needed */
3405 lsect->sym_hash->root.u.def.value += ARCH_SIZE / 8;
3407 fprintf (stderr, "Bump up %s by %ld, current value = %ld\n",
3408 lsect->sym_hash->root.root.string,
3409 (long)ARCH_SIZE / 8,
3410 (long)lsect->sym_hash->root.u.def.value);
3416 linker_section_ptr->offset = lsect->section->_raw_size;
3418 lsect->section->_raw_size += ARCH_SIZE / 8;
3421 fprintf (stderr, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
3422 lsect->name, (long)linker_section_ptr->offset, (long)lsect->section->_raw_size);
3430 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
3433 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
3436 /* Fill in the address for a pointer generated in alinker section. */
3439 elf_finish_pointer_linker_section (output_bfd, input_bfd, info, lsect, h, relocation, rel, relative_reloc)
3442 struct bfd_link_info *info;
3443 elf_linker_section_t *lsect;
3444 struct elf_link_hash_entry *h;
3446 const Elf_Internal_Rela *rel;
3449 elf_linker_section_pointers_t *linker_section_ptr;
3451 BFD_ASSERT (lsect != NULL);
3453 if (h != NULL) /* global symbol */
3455 linker_section_ptr = _bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
3459 BFD_ASSERT (linker_section_ptr != NULL);
3461 if (! elf_hash_table (info)->dynamic_sections_created
3464 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
3466 /* This is actually a static link, or it is a
3467 -Bsymbolic link and the symbol is defined
3468 locally. We must initialize this entry in the
3471 When doing a dynamic link, we create a .rela.<xxx>
3472 relocation entry to initialize the value. This
3473 is done in the finish_dynamic_symbol routine. */
3474 if (!linker_section_ptr->written_address_p)
3476 linker_section_ptr->written_address_p = true;
3477 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
3478 lsect->section->contents + linker_section_ptr->offset);
3482 else /* local symbol */
3484 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
3485 BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL);
3486 BFD_ASSERT (elf_local_ptr_offsets (input_bfd)[r_symndx] != NULL);
3487 linker_section_ptr = _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd)[r_symndx],
3491 BFD_ASSERT (linker_section_ptr != NULL);
3493 /* Write out pointer if it hasn't been rewritten out before */
3494 if (!linker_section_ptr->written_address_p)
3496 linker_section_ptr->written_address_p = true;
3497 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
3498 lsect->section->contents + linker_section_ptr->offset);
3502 asection *srel = lsect->rel_section;
3503 Elf_Internal_Rela outrel;
3505 /* We need to generate a relative reloc for the dynamic linker. */
3507 lsect->rel_section = srel = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
3510 BFD_ASSERT (srel != NULL);
3512 outrel.r_offset = (lsect->section->output_section->vma
3513 + lsect->section->output_offset
3514 + linker_section_ptr->offset);
3515 outrel.r_info = ELF_R_INFO (0, relative_reloc);
3516 outrel.r_addend = 0;
3517 elf_swap_reloca_out (output_bfd, &outrel,
3518 (((Elf_External_Rela *)
3519 lsect->section->contents)
3520 + lsect->section->reloc_count));
3521 ++lsect->section->reloc_count;
3526 relocation = (lsect->section->output_offset
3527 + linker_section_ptr->offset
3528 - lsect->hole_offset
3529 - lsect->sym_offset);
3532 fprintf (stderr, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
3533 lsect->name, (long)relocation, (long)relocation);
3536 /* Subtract out the addend, because it will get added back in by the normal
3538 return relocation - linker_section_ptr->addend;